81797067746 has 8 divisors (see below), whose sum is σ = 122945492304. Its totient is φ = 40815236980.

The previous prime is 81797067731. The next prime is 81797067763. The reversal of 81797067746 is 64776079718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41647220 + ... + 41649183.

It is an arithmetic number, because the mean of its divisors is an integer number (15368186538).

Almost surely, 2^81797067746 is an apocalyptic number.

81797067746 is a deficient number, since it is larger than the sum of its proper divisors (41148424558).

81797067746 is a wasteful number, since it uses less digits than its factorization.

81797067746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83296896.

The product of its (nonzero) digits is 24893568, while the sum is 62.

The spelling of 81797067746 in words is "eighty-one billion, seven hundred ninety-seven million, sixty-seven thousand, seven hundred forty-six".